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浙江大学学报(工学版)  2021, Vol. 55 Issue (3): 530-538    DOI: 10.3785/j.issn.1008-973X.2021.03.013
土木与交通工程     
低掺量水泥固化土的力学特性及微观结构
孙海超1,2(),王文军2,3,*(),凌道盛1,2
1. 浙江大学 岩土工程研究所 软弱土与环境土工教育部重点实验室,浙江 杭州 310058
2. 浙大宁波理工学院土木建筑工程学院,浙江 宁波 315100
3. 浙江大学 宁波研究院,浙江 宁波 315100
Mechanical properties and microstructure of solidified soil with low cement content
Hai-chao SUN1,2(),Wen-jun WANG2,3,*(),Dao-sheng LING1,2
1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
2. School of Civil Engineering and Architecture, NingboTech University, Ningbo 315100, China
3. Ningbo Research Institute, Zhejiang University, Ningbo 315100, China
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摘要:

针对某滩涂淤泥,开展不同淤泥初始水的质量分数、不同水泥掺量的固化土无侧限抗压强度试验、一维压缩试验以及扫描电镜试验,研究低掺量水泥固化土的力学特性与微观结构特征,探讨其与常规掺量固化土的差异. 结果表明:分界水泥掺量、最低水泥掺量与淤泥初始水的质量分数的线性关系明显;与常规掺量固化土相比,低掺量固化土的强度增长明显较慢,压缩性降低较少;固结屈服应力随水泥掺量增加而增大,在较低掺量区,固结屈服应力与水泥掺量具有非线性关系;低掺量固化土屈服前、后的孔隙形态特征以及孔隙排列特征差异较大,当固结压力小于固结屈服应力时,孔隙未呈现出明显的定向性且排列较为混乱,当固结压力大于固结屈服应力时,随着荷载的增加,孔隙形状变得圆滑,复杂程度降低,孔隙排列逐渐趋向于有序.

关键词: 水泥固化土力学特性分界水泥掺量固结屈服应力微观结构特征    
Abstract:

Unconfined compressive strength tests, one-dimensional compression tests and scanning electron microscope tests of solidified tideland sludge with different mass fractions of initial water and different cement contents were carried out. The mechanical properties and the microstructure characteristics of the solidified soil with low cement content and the differences from the solidified soil with conventional cement content were analyzed. Results show that the linear relationships between the boundary cement content, the minimum cement content and the initial moisture content of the sludg are obvious. Compared with the solidified soil with conventional cement content, the strength of the solidified soil with low cement content increases more slowly and its compressibility decreases less. The consolidation yield stress increases with the increase of cement content, and there is a nonlinear relationship between the consolidation yield stress and cement content in the low content range. There are great differences in the pore morphology and pore arrangement of the solidified soil with low cement content before and after yielding. When the consolidation pressure is less than the consolidation yield stress, pore orientation is not obvious, and pore arrangement is disordered. When the consolidation pressure is more than the consolidation yield stress, pore shape becomes smooth, the complexity decreases, and pore arrangement tends to be orderly with the increase of the load.

Key words: cement-solidified soil    mechanical property    boundary cement content    consolidation yield stress    microstructure characteristics
收稿日期: 2020-02-07 出版日期: 2021-04-25
CLC:  TU 411  
基金资助: 浙江省自然科学基金资助项目(LY19E080013);国家重点研发计划资助项目(2016YFC0800200)
通讯作者: 王文军     E-mail: 616547136@qq.com;wwjcumt@nit.zju.edu.cn
作者简介: 孙海超(1991—),男,硕士生,从事软黏土固化处理研究. orcid.org/0000-0002-0857-9462. E-mail: 616547136@qq.com
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引用本文:

孙海超,王文军,凌道盛. 低掺量水泥固化土的力学特性及微观结构[J]. 浙江大学学报(工学版), 2021, 55(3): 530-538.

Hai-chao SUN,Wen-jun WANG,Dao-sheng LING. Mechanical properties and microstructure of solidified soil with low cement content. Journal of ZheJiang University (Engineering Science), 2021, 55(3): 530-538.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2021.03.013        http://www.zjujournals.com/eng/CN/Y2021/V55/I3/530

wn/% Gs wL/% wP/%
80~91 2.72 46.5 26.3
表 1  滩涂淤泥的主要物理性质指标
试验类型 ww/% w0/wL D/mm h/mm 备注
无侧限抗压强度试验 4、6、8、10、12、16 1.50、1.75、2.00 39.1 80 加载速率/(mm·min?1):0.828
一维压缩试验 4、5、6、8、16 1.75 61.8 20 加荷等级/ kPa:12.5、25.0、50.0、100.0、200.0、
400.0、800.0、1 600.0、2 400.0、3 200.0、4 000.0
扫描电镜试验 4、5、6、8、16 1.75 ? ? ?
表 2  固化土试验方案
图 1  无侧限抗压强度随水泥掺量的变化
w0/% Δqu /kPa
ww<wwc ww>wwc
1.50 wL 97.2 154.0
1.75 wL 69.3 144.6
2.00 wL 55.9 120.5
表 3  每增加1%水泥掺量时固化土强度增长量
图 2  分界水泥掺量与淤泥初始水的质量分数与淤泥液限比值的拟合曲线
图 3  最低水泥掺量与淤泥初始水的质量分数的拟合曲线
图 4  无侧限抗压强度与水灰比的归一化曲线
图 5  不同水泥掺量固化土的SEM图像(10 000倍)
图 6  孔隙累积分布曲线
图 7  某尺度范围内孔隙数量占比分布
图 8  一维压缩试验曲线
ww/% a1/MPa?1 a2/MPa?1 Es1/MPa Es2/MPa Cs Cc
4 0.53 1.11 6.19 2.86 0.05 0.88
5 0.51 0.81 6.28 3.89 0.05 0.78
6 0.17 0.40 18.85 7.38 0.03 0.76
8 0.13 0.30 24.77 9.93 0.03 0.76
16 0.03 0.10 80.54 27.65 0.02 0.68
表 4  固化土屈服前、后的压缩性指标
图 9  双对数压缩曲线
图 10  固结屈服应力随水泥掺量的变化
图 11  平均孔隙面积随固结压力的变化
图 12  面积概率分布指数随固结压力的变化
图 13  孔隙概率熵随固结压力的变化
图 14  不同固结压力下固化土样竖直切面孔隙玫瑰图
图 15  孔隙平均形状系数随固结压力的变化
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